Uptime & SLA Calculator

Translate availability promises into real downtime budgets. Compare 99%, 99.9%, 99.95%, 99.99%, and custom targets, then calculate your actual uptime from incidents, maintenance windows, and outages.

Downtime budgets Actual uptime calculator Incident tracker Client-side only

Availability target

Pick a common uptime tier or enter your own target. Budgets update instantly across common time windows.

Availability target (%)

Actual uptime period

Planned maintenance counts as

Allowed downtime / month—

Allowed downtime / year—

Error budget used0%

Actual uptime—

Window	Max downtime	As decimal availability	Error budget

Rule of thumb: every extra 9 gets dramatically more expensive. Three nines allows 43m 49s of downtime per month. Four nines cuts that to 4m 19s.

Incident-based uptime

Track outages for the selected period. You can paste lines like API outage, 34, unplanned or add them one by one.

Incident name

Downtime (minutes)

Incident type

Bulk import incidents

Counted downtime0m

Ignored maintenance0m

Remaining budget—

SLA status—

No incidents added yet.

Add outages to see whether your current period still meets the target.